Experimental Study on Scour and Velocity Field Around Bridge Piers PDF Download
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Author: Vincenza Cinzia Santoro
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 284
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Book Description
Author: Vincenza Cinzia Santoro
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 284
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Book Description
Author: Decker Bradley Hains
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 754
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Book Description
The results confirmed various field observations and demonstrated that the pressure flow condition and cover roughness influence the scour mechanisms, specifically, the type and depth of scour. The pressure flow condition shifts the location of the maximum velocity toward the smoother boundary and accelerates the rate of scour. At the same average velocity, the flow has a greater maximum velocity under a rough cover when compared to a smooth cover. Furthermore, these effects combine to influence the scour at bridge piers. For a rough cover and pressurized flow, typical of ice frozen to bridge piers, the maximum velocity in the flow shifts toward the bed, which is the smoother boundary. This results in live-bed scour with greater maximum depths of scour than under clear-water conditions at the same relative velocity.
Author: Jueyi Sui
Publisher:
ISBN:
Category : Electronic books
Languages : en
Pages : 0
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Book Description
A precise prediction of maximum scour depth (MSD) around piers under ice-covered conditions is crucial for the safe design of the bridge foundation. Due to the lack of information for local scour under ice-covered flow condition, it is extremely hard to give proper estimation of MSD. In the current study, a set of flume experiments were completed to investigate local scour around four pairs of circular bridge piers with nonuniform bed materials under open channel, smooth and rough ice cover conditions. Three different bed materials with median particle size of 0.47, 0.50, and 0.58 mm were used to simulate natural river conditions. Regardless of pier size, the maximum scour depths were observed in front of the piers under all flow conditions. Additionally, a smaller pier size and a larger space between piers yield a smaller scour depth. Results showed that the maximum scour depth decreases with increase in the grain size of armor layer. The distribution of vertical velocity shows that the strength of downfall velocity is the greatest under rough ice cover. Empirical equations were developed to estimate the maximum scour depth around side-by-side bridge piers under both open-channel and ice-covered flow conditions.
Author: Mohammad Reza Namaee
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
Local scour around piers and abutments is one of the main causes of the collapse of many bridges constructed inside rivers. Many researchers have conducted various studies to predict the maximum depth of a scour hole around bridge piers and abutments. However, most of them have been done in small-scale laboratory flumes and specifically for the open channel condition. Besides, most of the existing research on bridge piers uses uniform sediment which is not an appropriate representative of natural river systems. This can result in excessively conservative design values for scour in low risk or non-critical hydrologic conditions. The most severe cases of bridge pier scouring occur in cold regions when the surface of water turns into ice in which, an additional boundary layer is being added to the water surface, which leads to significant changes in the flow field and scour pattern around bridge piers. Ice cover also causes the maximum flow velocity to move closer to the channel bed.
Author: Willi H. Hager
Publisher: Springer Science & Business Media
ISBN: 3642113834
Category : Science
Languages : en
Pages : 660
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Book Description
The second, enlarged edition of this established reference integrates many new insights into wastewater hydraulics. This work serves as a reference for researchers but also is a basis for practicing engineers. It can be used as a text book for graduate students, although it has the characteristics of a reference book. It addresses mainly the sewer hydraulician but also general hydraulic engineers who have to tackle many a problem in daily life, and who will not always find an appropriate solution. Each chapter is introduced with a summary to outline the contents. To illustrate application of the theory, examples are presented to explain the computational procedures. Further, to relate present knowledge to the history of hydraulics, some key dates on noteworthy hydraulicians are quoted. A historical note on the development of wastewater hydraulics is also added. References are given at the end of each chapter, and they are often helpful starting points for further reading. Each notation is defined when introduced, and listed alphabetically at the end of each chapter. This new edition includes in particular sideweirs with throttling pipes, drop shafts with an account on the two-phase flow features, as well as conduit choking due to direct or undular hydraulic jumps.
Author: B. Mutlu Sumer
Publisher: World Scientific
ISBN: 9789810249304
Category : Science
Languages : en
Pages : 558
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Book Description
Treats the subject of local sour around different kinds of marine structures, exposed to waves and/or currents.
Author:
Publisher:
ISBN:
Category : Armourstone
Languages : en
Pages : 92
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Book Description
Author: T−ojir−o Ishihara
Publisher:
ISBN:
Category : Bridges
Languages : en
Pages : 342
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Book Description
Author: Nangantani Davies Godfrey Mtundu
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Book Description
Author: H.N.C. Breusers
Publisher: CRC Press
ISBN: 1000108503
Category : Technology & Engineering
Languages : en
Pages : 152
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Book Description
Information and technical data concerning scouring/erosion caused by water fl in rivers and streams. More specifically, how certain structures exaggerate this natural process by restricting water flow, causing constriction and loc scour. Material presented is from both field studies and laboratories
